As no system of.

14+101/j=241/, 6 E9 27 6+21 D 60+60=120 16+16=32 7Vj 240 120 4x30 E 60+ 60=120 10‘/a+14=24‘/t «*/t 168 48 6+2x21 E 60+60=120 18+12* =30 6 180 60 1.